Kate hoping George and Charlotte will take Pippa´s wedding in their stride

The Duchess of Cambridge has revealed she is a little worried about how her children will behave at her sister Pippa Middleton’s wedding at the weekend.

Kate spoke about her concerns when she joined the Queen, Duke of Edinburgh and other senior royals for the first royal garden party of the year, where Philip was spotted joking with a fellow retiree.

Andrew Bates and wife Janet, chatted to Kate as she mingled with the guests, while nearby her husband William spoken to some of the thousands invited to the annual event.

The Duchess of Cambridge (centre) talks to guests during a garden party at Buckingham Palace

Prince George and Princess Charlotte will play starring roles as a page boy and bridesmaid at the wedding of Pippa and her fiance, financier James Matthews, being held on Saturday at St Mark’s church, in the Berkshire village of Englefield.

Mr Bates, 55, from Coventry said about Kate: “She said that they were all really looking forward to her sister’s wedding at the weekend but she was a bit worried about how her children might behave. She said she was hopeful that they would be good but you never know at that age.”

(The Duchess of Cambridge/PA)

Kate, who wore an outfit by Christopher Kane and matching hat by Lock & Co, also chatted to Daniel and Jodie Bell, originally from Adelaide in Australia but now living in the UK for the past six months.

Mr Bell is a Warrant Officer 2nd Class and a combat engineer in the Australian Defence Force working as an instructor in Britain.

Mrs Bell said about Kate: “She’s just stunning and she was telling us how she would like to go back to Australia on a holiday with the family.”